Please download videos from project page, and extract video frames. how to do that？

[jun0wanan]

Thank you！

[jun0wanan]

hi， Please download videos from project page, and extract video frames. I checked the mask. Json and wondered if 127 frames were extracted from each video？ hope your reply ，or I will not know how to conduct the experiment ....

[adiah80]

I used the below code to obtain image frames from videos:

import cv2

def get_image_arr(video_path):
    '''Return the Image frame array corresponding to a video path'''

    image_arr = []
    vidcap = cv2.VideoCapture(video_path)
    while True:
        success, image = vidcap.read()
        if(not success): 
            break
        image_arr.append(image[:,:,::-1])
    return image_arr

You should get 128 frames from each video.

[iGeralt]

Use following code to get frames from videos and it will automatically place video frames in the folder as described in readme.

import os
import cv2

if not os.path.exists('video_frames'):
    os.makedirs('video_frames')

#create sim_00000 to sim_19999
for i in range(0,20000):
    num = str(i).zfill(5)
    if not os.path.exists('video_frames/sim_%s'%num):
        os.makedirs('video_frames/sim_%s'%num)

basepath = 'Videos/'
list_of_videos = {}
for entry in os.listdir(basepath):
    new_path = os.path.join(basepath, entry) + str("/")
    #print(new_path)
    for new_entry in os.listdir(new_path):
        video_num = new_entry[6:11]
        video_path = os.path.join(new_path, new_entry)
        if os.path.isfile(video_path):
            list_of_videos[video_num] = video_path 
            #print(video_path)

for vnum, vpath in list_of_videos.items():
    vidcap = cv2.VideoCapture(vpath)
    success,image = vidcap.read()
    count = 0
    while success:
        c = str(count).zfill(5)
        write_path = "video_frames/sim_" + str(vnum) + "/frame_" + c + ".png"
        cv2.imwrite(write_path, image)          
        success,image = vidcap.read()
        print('Read a new frame: ', success)
        count += 1

Correct me if I am wrong. :)

[jun0wanan]

Thank you!

At 2020-10-08 22:56:19, "Sujeet Maurya" notifications@github.com wrote:

Use following code to get frames from videos and it will automatically place video frames in the folder as described in readme. ` import os import cv2

create parent path

if not os.path.exists('video_frames'): os.makedirs('video_frames')

create sim_00000 to sim_19999

for i in range(0,20000): num = str(i).zfill(5) if not os.path.exists('videoframes/sim%s'%num): os.makedirs('videoframes/sim%s'%num)

basepath = 'Videos/' list_of_videos = {} for entry in os.listdir(basepath): new_path = os.path.join(basepath, entry) + str("/")

print(new_path)

for new_entry in os.listdir(new_path): video_num = new_entry[6:11] video_path = os.path.join(new_path, new_entry) if os.path.isfile(video_path): list_of_videos[video_num] = video_path

print(video_path)

for vnum, vpath in list_of_videos.items(): vidcap = cv2.VideoCapture(vpath) success,image = vidcap.read() count = 0 while success: c = str(count).zfill(5) write_path = "videoframes/sim" + str(vnum) + "/frame_" + c + ".png" cv2.imwrite(write_path, image) # save frame as JPEG file success,image = vidcap.read() print('Read a new frame: ', success) count += 1 `

Correct me if I am wrong. :)

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[chuangg]

LGTM!